Force is any attempt to change the motion of an object and is measured in __________.

Force is quantified using units that express the amount of pull or push exerted on an object, and the primary units for measuring force in the International System of Units (SI) are Newtons (N). In addition to Newtons, the pound-force (lbf) is commonly used in the Imperial system, particularly in the United States.

Using this understanding, the correct answer encompasses both of these units of measurement, which are applicable in various contexts depending on the measurement system being utilized. This makes the answer comprehensive and relevant for understanding force in both metric and imperial terms. The other options present different types of measurements and units that do not relate directly to the concept of force; for instance, foot-pounds measure energy or work rather than force, while pounds per square inch (psi) and pounds per square foot (psf) are units of pressure and intensity, respectively. Thus, they do not accurately represent the measurement of force.